code help, confused.

This code works perfectly, when you flick the piezo it go off for a while. The downside is that the light is solid and unfaltering.

 /* piezo sketch
* lights and LED when the Piezo is tapped
*/

int sensorPin = 5;  // the analog pin connected to the sensor
int ledPin  = 9;     // pin connected to LED
int THRESHOLD = 4;
float sinVal;
int ledVal;


void setup()
{
   pinMode(ledPin, OUTPUT);
}

void loop()
{

  int val = analogRead(sensorPin);
 
  if (val >= THRESHOLD)
  {
    digitalWrite(ledPin, LOW);
    delay(100000);  // to make the LED visible
  }
 
  else{
   
    digitalWrite(ledPin, HIGH);
  }
 

}

BUUUT if I only change one thing, the "digitalWrite(ledPin, HIGH);" to "digitalWrite(ledPin, HIGH); delay(50); digitalWrite(ledPin, LOW); delay(40);" it will flicker, but it won't respond to the piezo. Which is weird bc the code is still correct. I asked lin already, anybody have any ideas?